First you must have a Bulky Pokemon so he can put sunny day...
or Ninetales with Drought...
Next try to have a Pokemon that can put the opponent sleeping so you can put you SIMISEAR and give some Nastly Plot (Egg move- Zoroark)
Then you will take advantage to the sunlight and start the Simi Rampage:
Nastly Plot!
Overheat
Solarbeam
Focus Blast!
I hope you enjoy! :D
By the way EV train SPEED (FULL- 331) AND SP.Attack( 295)